Microballons of laminar dual hydroxy composite metal oxide and preparation method

A layered double hydroxyl and composite metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as catalyst separation and recycling impact, Achieve the effect of being suitable for industrialized production and the preparation method is simple

Inactive Publication Date: 2007-10-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the above literature, hydrotalcite-like materials have shown good catalytic effect as catalyst precursors. However, these materials are added in the form of powder when used, which brings difficulties to the separation and recycling of catalysts after the reaction. negative effect

Method used

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  • Microballons of laminar dual hydroxy composite metal oxide and preparation method
  • Microballons of laminar dual hydroxy composite metal oxide and preparation method
  • Microballons of laminar dual hydroxy composite metal oxide and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A: Weigh 61.54g Mg(NO 3 ) 2 ·6H 2 O and 45.02g Al(NO 3 ) 3 9H 2 O was dissolved in deionized water to make 300mL mixed salt solution; then weighed 23.04g NaOH and 25.44g NaOH 2 CO 3 Dissolve in deionized water to make 300mL mixed alkali solution; add the above two mixed solutions into the total back-mixed liquid membrane reactor at the same time, adjust the slit width between the reactor rotor and stator to 0.02mm, the working voltage to 100V, and the rotor speed The temperature is 4000rpm, and the obtained mixed slurry is added to the crystallization kettle for stirring, and the temperature of the mixed slurry in the kettle is kept at 95-105°C for reflux crystallization for 6 hours to obtain magnesium-aluminum hydrotalcite;

[0043] B: fully wash the product prepared in step A with deionized water so that the pH of the supernatant is 7-8, add deionized water and fully stir to form a slurry with a solid content of 2%;

[0044] C: Add PVA accounting for 1% of the ...

Embodiment 2

[0047] A: with embodiment 1;

[0048] B: with embodiment 1;

[0049] C: Add PVA accounting for 5% of the total weight of the slurry to the hydrotalcite-like slurry in step B, and fully stir to make the system in a uniform colloidal state;

[0050] D: Pour the colloidal slurry in step C into the atomizing wheel rotating at a high speed of 12,000 rpm with a constant flow pump at a flow rate of 6 to 10 mL / min, and set the temperature at the inlet of the spray drying to 150°C. Perform spray granulation.

Embodiment 3

[0052] A: with embodiment 1;

[0053] B: with embodiment 1;

[0054] C: Add PVA accounting for 10% of the total weight of the slurry to the hydrotalcite-like slurry in step B, and fully stir to make the system in a uniform colloidal state;

[0055] D: Pour the colloidal slurry in step C into the atomizing wheel rotating at a high speed of 12,000 rpm with a constant flow pump at a flow rate of 6 to 10 mL / min, and set the temperature at the inlet of the spray drying to 150°C. Perform spray granulation.

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Abstract

This invention relates to a method for preparing lamellar dihydroxyl composite metal oxide microspheres. The method comprises: preparing lamellar dihydroxyl composite metal oxide (hydrotalcite) nano- or submicro-particles by co-precipitation, nucleation / crystallization / isolation, nonequilibrium crystallization or hydrothermal synthesis, preparing into slurry with a certain solid content, adding bonding agent, spin-spraying for granulation, and drying to obtain microspheres with diameters of 5-100 mu.m. The bulk density, specific surface area, pore volume and most probable pore diameters of the microspheres are 0.4-0.8 g / cm3, 40-150 m2 / g, 0.1-0.8 cm3 / g and 2-40 nm, respectively. The microspheres can be directly used for catalysis or separation after activated, and the mass transfer resistance and carbon accumulation are minimized.

Description

technical field [0001] The invention relates to a layered double hydroxyl compound metal oxide microsphere and a preparation method thereof, in particular to a molding process which takes nanometer or submicron layered double hydroxyl compound metal oxide particles with strong rigidity as the building unit. grain method. Background technique [0002] Hydrotalcite compounds include hydrotalcite (Hydrotalcite) and hydrotalcite-like compound (Hydrotalcite-like compound), the main body of which is generally composed of two metal hydroxides, so it is also called layered double hydroxyl compound metal oxide (Layered Double Hydroxide, Abbreviated as LDH). The intercalation compound of LDH is called intercalation hydrotalcite. Hydrotalcites, hydrotalcite-like materials, and intercalated hydrotalcites are collectively referred to as hydrotalcite-like intercalation materials (LDHs). The material has a hexagonal sheet structure, and the sheet itself has extremely strong rigidity, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/00B01J35/10
CPCC01F7/005B01J23/007B01J23/80B01J37/0045C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2006/11C01P2006/12C01P2006/14C01P2006/16C01F7/785
Inventor 张法智王彦昌王晓颖段雪徐赛龙
Owner BEIJING UNIV OF CHEM TECH
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